METHOD FOR RECLAIMING IRON AND PHOSPHORUS FROM STEELMAKING SLAG

摘要

Disclosed is a method for reclaiming iron and phosphorus from steelmaking slag, which comprises a first process, in which steelmaking slag that contains phosphorous, such as dephosphorization slag, is reduction treated using a reducing agent, such as carbon, Si, or Al, to reduce and recover iron oxides and phosphorus oxides in the slag as phosphorus-containing molten steel, a second process, in which the steelmaking slag, from which the iron oxides and phosphorus oxides have been removed, is used as a CaO source in a sintering process, and the resulting sintered ore is recycled to a blast furnace, a third process, in which the phosphorus-containing molten steel recovered by the aforementioned reduction treatment is dephosphorization treated until the phosphorus concentration in the phosphorus-containing molten steel reaches 0.1% by mass or less, and the phosphorus is concentrated into a CaO-based flux, and a fourth process, in which the phosphorus-containing molten steel with a phosphorus concentration of 0.1% by mass or less is mixed as an iron source in the blast furnace hot metal, whereby phosphorus and iron can be inexpensively recovered from said steelmaking slag, and the reclaimed phosphorus and iron can each be effectively used as resources.